net: bcmgenet: Clear RGMII_LINK upon link down

Clear the RGMII_LINK bit upon detecting link down to be consistent with
setting the bit upon link up. We also move the clearing of the
out-of-band disable to the runtime initialization rather than for each
link up/down transition.

Signed-off-by: Florian Fainelli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: ffainelli

drivers/net/ethernet/broadcom/genet/bcmmii.c

@@ -72,7 +72,6 @@ static void bcmgenet_mac_config(struct net_device *dev)
 	 * Receive clock is provided by the PHY.
 	 */
 	reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
-	reg &= ~OOB_DISABLE;
 	reg |= RGMII_LINK;
 	bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 
@@ -95,10 +94,18 @@ static void bcmgenet_mac_config(struct net_device *dev)
  */
 void bcmgenet_mii_setup(struct net_device *dev)
 {
+	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct phy_device *phydev = dev->phydev;
+	u32 reg;
 
-	if (phydev->link)
+	if (phydev->link) {
 		bcmgenet_mac_config(dev);
+	} else {
+		reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
+		reg &= ~RGMII_LINK;
+		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
+	}
+
 	phy_print_status(phydev);
 }
 
@@ -266,18 +273,20 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 			(priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
 
 	/* This is an external PHY (xMII), so we need to enable the RGMII
-	 * block for the interface to work
+	 * block for the interface to work, unconditionally clear the
+	 * Out-of-band disable since we do not need it.
 	 */
+	reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
+	reg &= ~OOB_DISABLE;
 	if (priv->ext_phy) {
-		reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
 		reg &= ~ID_MODE_DIS;
 		reg |= id_mode_dis;
 		if (GENET_IS_V1(priv) || GENET_IS_V2(priv) || GENET_IS_V3(priv))
 			reg |= RGMII_MODE_EN_V123;
 		else
 			reg |= RGMII_MODE_EN;
-		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 	}
+	bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 
 	if (init)
 		dev_info(kdev, "configuring instance for %s\n", phy_name);